Message Types; Figure 16 Illustration Of Contents Of Messages 0, 1, And 2 - Vaisala PWD22/52 User Manual

USER'S GUIDE____________________________________________________________________
10 680 1230
↓↓ ↓
------ 10 min ave visibility
------- one minute average visibility
- 1=hardware error, 2= hardware warning, 
3= backscatter alarm, 4= backscatter warning
- 1= visibility alarm 1, 2= visibility alarm 2,
3 = visibility alarm 3
Example with frames
□PW
1□00 680
S S
PW 1 00 680
H X
1234567890123456789012345
NUMBERS mark the character positions.
50 __________________________________________________________________ M210543EN-E

Message Types

Message 2 is intended to be the standard present weather message. The
length of the STAtus Message 3 depends on the possible alarm and
warning states.
PWD22/52 adds frame strings to the polled and automatic messages. The
content of the frame strings is presented in the following:
PW id message body
S S
H X
where
S
= Start of heading (ASCII 1, non-printable character).
H
PW = PWD sensor identifier.
= Space character.
id = Unit identifier, 2 characters. If the ID is not defined, characters
space and 1 are shown.
S
= Start of text (ASCII 2, non-printable character).
X
message body
E
= End of text (ASCII 3, non-printable character).
X
C L
= CR + LF (ASCII 13 + ASCII 10).
R F
The contents of messages 0, 1, and 2 are illustrated in Figure 16 below.
← THE FIRST ROW IS THE OUTPUT
↓
1230□
E C L
1230
X R F
Figure 16 Illustration of Contents of Messages 0, 1, and 2
E C L
X R F


FIELD
DESCRIPTIONS